Scalar dark matter explanation of the excess in the Belle II $B^+\to K^+ +$ invisible measurement
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914859805835264 |
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| author | He, Xiao-Gang Ma, Xiao-Dong Schmidt, Michael A. Valencia, German Volkas, Raymond R. |
| author_facet | He, Xiao-Gang Ma, Xiao-Dong Schmidt, Michael A. Valencia, German Volkas, Raymond R. |
| contents | Recently Belle II reported the first measurement of $B^+\to K^++{\rm invisible (inv)}$, which is $2.7σ$ above the standard model (SM) prediction. If confirmed, this calls for new physics beyond SM. In the SM, the invisible particles are neutrino-anti-neutrino pairs. There are more possibilities when going beyond the SM. In this work, we focus on decays to dark matter (DM) and show that the $B\to K +\mathrm{inv}$ excess from Belle II and DM relic density can be simultaneously explained in a simple extension of the SM. The model introduces a real scalar singlet $ϕ$ acting as a DM candidate, and two heavy vector-like quarks $Q,D$ with the same quantum numbers as the SM left-handed quark doublet and right-handed down-type quark singlet, respectively. All these new particles are odd under a $\mathbb{Z}_2$ symmetry while the SM particles are even. The model can successfully explain the Belle II anomaly and DM relic density for TeV-scale heavy quarks with hierarchical Yukawa couplings involving $b$ and $s$ quarks. At the same time, it can easily satisfy other flavour physics constraints. Direct detection searches utilizing the Migdal effect constrain some of the parameter space. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12485 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Scalar dark matter explanation of the excess in the Belle II $B^+\to K^+ +$ invisible measurement He, Xiao-Gang Ma, Xiao-Dong Schmidt, Michael A. Valencia, German Volkas, Raymond R. High Energy Physics - Phenomenology Recently Belle II reported the first measurement of $B^+\to K^++{\rm invisible (inv)}$, which is $2.7σ$ above the standard model (SM) prediction. If confirmed, this calls for new physics beyond SM. In the SM, the invisible particles are neutrino-anti-neutrino pairs. There are more possibilities when going beyond the SM. In this work, we focus on decays to dark matter (DM) and show that the $B\to K +\mathrm{inv}$ excess from Belle II and DM relic density can be simultaneously explained in a simple extension of the SM. The model introduces a real scalar singlet $ϕ$ acting as a DM candidate, and two heavy vector-like quarks $Q,D$ with the same quantum numbers as the SM left-handed quark doublet and right-handed down-type quark singlet, respectively. All these new particles are odd under a $\mathbb{Z}_2$ symmetry while the SM particles are even. The model can successfully explain the Belle II anomaly and DM relic density for TeV-scale heavy quarks with hierarchical Yukawa couplings involving $b$ and $s$ quarks. At the same time, it can easily satisfy other flavour physics constraints. Direct detection searches utilizing the Migdal effect constrain some of the parameter space. |
| title | Scalar dark matter explanation of the excess in the Belle II $B^+\to K^+ +$ invisible measurement |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.12485 |